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BKDR_PADPIN.A

October 08, 2014
 Analysis by: Rhena Inocencio
 ALIASES:

Backdoor.MSIL.Tyupkin.a (Kaspersky), Backdoor.Padpin (Symantec)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware


This malware was involved in the September 2014 ATM hacking attacks involving Malaysian banks. Systems affected by this malware can be considered compromised, and organizations using these systems may find their finances being affected.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

118,784 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Apr 2014

Payload:

Compromises system security

Arrival Details

This Trojan may be dropped by other malware.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
ulssm.exe = "{malware path}\ulssm.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ulssm.exe = "{malware path}\ulssm.exe"

Other Details

This Trojan requires the existence of the following files to properly run:

  • XFS

It does the following:

  • It may perform any of the following functions:
    • Uninstall itself
    • Dispense cash from selected ATM cassette
    • Show cassette information
      • nominal
      • items left (number of bills stored)
      • total (total amount stored)
    • Show cash unit information
    • Disable network connection

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.856.07

FIRST VSAPI PATTERN DATE:

09 Apr 2014

VSAPI OPR PATTERN File:

10.857.00

VSAPI OPR PATTERN Date:

10 Apr 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

 
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • ulssm.exe = "{malware path}\ulssm.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • ulssm.exe = "{malware path}\ulssm.exe"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_PADPIN.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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